doc: Add xrefs to the lsh manual.

Suggested by Adam Pribyl <pribyl@lowlevel.cz>.

* gnu/services/ssh.scm (lsh-service): Update docstring with xrefs to
  the lsh manual.  Fix typos.
* doc/guix.texi (Networking Services): Synchronize.

doc/guix.texi

@@ -4033,12 +4033,17 @@ When @var{initialize?} is true, automatically create the seed and host key
 upon service activation if they do not exist yet.  This may take long and
 require interaction.
 
+When @var{initialize?} is false, it is up to the user to initialize the
+randomness generator (@pxref{lsh-make-seed,,, lsh, LSH Manual}), and to create
+a key pair with the private key stored in file @var{host-key} (@pxref{lshd
+basics,,, lsh, LSH Manual}).
+
 When @var{interfaces} is empty, lshd listens for connections on all the
 network interfaces; otherwise, @var{interfaces} must be a list of host names
 or addresses.
 
-@var{allow-empty-passwords?} specifies whether to accepts log-ins with empty
-passwords, and @var{root-login?} specifies whether to accepts log-ins as
+@var{allow-empty-passwords?} specifies whether to accept log-ins with empty
+passwords, and @var{root-login?} specifies whether to accept log-ins as
 root.
 
 The other options should be self-descriptive.

gnu/services/ssh.scm

@@ -91,12 +91,17 @@ (define* (lsh-service #:key
 upon service activation if they do not exist yet.  This may take long and
 require interaction.
 
+When @var{initialize?} is false, it is up to the user to initialize the
+randomness generator (@pxref{lsh-make-seed,,, lsh, LSH Manual}), and to create
+a key pair with the private key stored in file @var{host-key} (@pxref{lshd
+basics,,, lsh, LSH Manual}).
+
 When @var{interfaces} is empty, lshd listens for connections on all the
 network interfaces; otherwise, @var{interfaces} must be a list of host names
 or addresses.
 
-@var{allow-empty-passwords?} specifies whether to accepts log-ins with empty
-passwords, and @var{root-login?} specifies whether to accepts log-ins as
+@var{allow-empty-passwords?} specifies whether to accept log-ins with empty
+passwords, and @var{root-login?} specifies whether to accept log-ins as
 root.
 
 The other options should be self-descriptive."